Mold.



`P. B. MOTLEY.

MOLD.

APPLIGATION FILED FEB. 2

'1m Patented Apr.21,1914

3 SHEETS-SHEET 2.

liv-WM @ww W/nesses.

per orney COLUMBIA PLANOGRAPH cn., WASHINGTON. n. c.

P. B. MOTLEY.

MOLD.

APPLICATION FILED FEB. 2, 1911.

Patented Apr.21,'1911 3 SHEETS-SHEBT 3.

l /nVer/l'ol per Hor/rey H//essea Lawa? j TED STATES PATEN T OFFICE.

PHILLIPS BATI-IURST MOTLEY, OF WESTMOUN'TQQUEBEC, CANADA, ASSIGNOR T0 HIMSELF, CHARLES NICHOLAS MONSARBAT, ANI) JOI-IN G. SULLIVAN, OF WEST- MOUNT, CANADA.

MOLD.

rossetti.

Specification of Letters Patent.

Patented Apr. 21, 1914.

To all fic/1.0m t may concern:

Re it known that I, PHILLIPS BA'rI-IURST Mortier, a subject of the King of Great Britain, residing at wWestmount, in the Province of Quebec, Dominionof Canada, have invented certain new and useful Improvements in Molds, of which the following is a specification.

My invention has particular reference to apparatus for use in the molding of hollow members .from concrete or cement, and has for its object to provide a mold for this purpose including a vcore every side whereof is a component part of the matrix and the core itself may be removed from the molded member by contracting the transverse area of the core and the extremities of its contour without breaking the continuity of its surface and therefore obviatingcthe danger of disturbing or damaging the interior of the molded member.

The invention may be said to consist of the combination and particular arrangement and construction of parts hereinafter described and pointed out in the claims.

For full comprehension however of my invention reference must be had to the accompanying drawings, forming a part of this specification, in which similar' reference characters indicate the same parts and wherein Figure l is a horizontal sectional view of my improved mold taken on line A A Fig. 2; Fig. 2 is a transverse vertical sectional view taken on line B B Fig. l; Fig. 3 is a detail view of a part of the means for locking the members of the shell together; Fig. it is transverse sectional view of a hollow member molded by means of the improved mold; and Fig. 5 is a longitudinal sectional view of the molded hollow members; Fig. 6 is a plan view of the inner side of the cover; Fig. 7 is a detail sectional view taken on line C C Fig. G; Fig. 8 is a plan view of the lplatform upon which the mold is supported;

Fig. 9 is a detail sectional view taken on line D D Fig. 8.

Specifically, the mold comprises besides the core, a shell adapted to be knocked down, a platform, andl a cover, and the mold illustrated is for use in forming railway culverts. The core consists of three corner bars of substantially sectoral cross-section the fiat sides b b of which face inward relatively to the core, and the subtended arcs c of which are presented outwardly and constitute rounded corners for the core. A series of three sheet metal plates l have their side edges countersunk into these corner bars and form therewith an equilateral triangular ligure with rounded corners and having a perimeter of permanently unbroken continuity, while the natural resiliency of the plates permit them to be sprung inwardly and thus contract the core to a considerable extent.

`This contraction of the core is effected by means of an axially movable center baer preferably of a cross-section presenting three flanges g each connected by a pair of toggle links 7c with angle irons m riveted or otherwise fixed upon the inside of the plates d, the connection between the toggle links and the center bar and angle irons being of ya pivotal nature to permit axial movement of the bar relatively to the core. This core is the inner wall of the matrix, and the outer wall thereof consists of three engaging members each constructed of an interiorly concaved wall 0 preferably made up of wooden staves united by a pair of cleats p, the staves being tongue-and-grooved and the interior surface thereof dressed to be perfectly smooth and present easy curves. The cleats of these different shell members register with each other as shown in Fig. l and one end of each is notched as at S and sheared off slightly, and the opposite end has a staple t pivoted thereto and adapted to be looped over the notched end of the cleat of the adjoining shell member. If necessary the joint thus effected may be tightened by driving wedges between this staple and the sheared off faces over which it is looped.

The platform is shown at 2 in Figs. 2, 6 and 7 and has a round cornered triangular form 3 mounted thereon and conforming in plan to the cross-section of the hollow section to be molded, in that its sides have straight inner lines and convex`outer or boundary lines. This form 3 presents in cross-section a die Fig. 7, capable of producing a socket t in one end of the molded section.

The cover is shown in Figs. l, G and 7 and has mounted thereon a form 5 corresponding with the form 3 on the platform excepting that its cross-section presents a die, Fig. 5, capable of producing a spigot 6 adapted to t into the socket t of an adj oining hollow section. This cover consists of the form or die Y5 reinforced by corner plates I0 and battens 12 disposed to present an open middle 14. lVhen ready for operation the contractible core fits snugly the interior of the forms 3 and 5 and the shell fits in a like manner the exterior thereof; while the surface of the platform and the core and shell make an even oint, and the whole has a level floor or base 520 preferably of railway ties or other timber.

Operation: The floor is built at any convenient point preferably adjacent to the place where the culvert is to be laid, although the form of hollow member produced owing to its particular contour and strength is well adapted for shipment or storage. The core is set in place and the center bar thereof pushed down until it is stopped by the platform which has the eiect of setting the plates d in straight lines between the corner bars and with their lines merging into the lines of the arcoid sides of such corner bars. The shell is then assembled and set in place, and a sheet, 25, of expanded metal looped and having its ends joined is placed in the matrix near the core, and the matrix is then packed with concrete, the cover pressed into position, and the concrete permitted to set, after which, while the core is held against displacement by the cover, the center bar is lifted thus drawing upon the toggle links and the plates l the natural resiliency of which latter permit them to spring inwardly thereby also drawing the corner bars inwardly with the result that the complete core is contracted without the continuity of its perimeter being broken. rIhe cover can then be removed and the contracted core lifted out without damage to the molded culvert. Upon the removal of the shell the culvert is free to be put in use.

The underlying principle involved in this invention is the continuity of the wall of the matrix containing the resilient plates which permit the form of the wall to be .changed and the matrix to be enlarged without breaking the said continuity.

What I claim is as follows l. In a mold the combination with a shell, of a core consisting of a plurality of inflexible corner members and a plurality of resilient side members uniting the said corner members; and means for inwardly bending the said side members.

2. In a mold the combination with a shell, of a core consisting of a plurality of wooden corner members presenting arcoid outer surfaces and resilient metal plates rigidly fastened to the said corner members and forming therewith an encircling matrix surface of unbroken continuity; and means for inwardly bending the said plates.

3. In a mold the combination with a triangular shell the interior of the sides whereof are concave, and the corners round, of a triangular core, consisting of inflexible corner members presenting round outer surfaces disposed in coincidence with the round corners of the shell, resilient side plates secured to the said corner members, and plpates. means for inwardly springing the said plates.

In testimony whereof I have signed my name to this specification in the presence of two witnesses.

PHILLIPS BATHURST MOTLEY.

Vitnesses NORVAL DonsoN, E. NooNAN.

Copies of this patent may rbe obtained for ve cents each, by addressing the Commissioner of Yatents, Washington, D. C. 

